Does anyone here know about music theory?

Does the musical alphabet stay the same regardless of what instrument you are playing?

For example, what note is a step above D flat on a guitar?

What note is a step above a D flat on a piano?

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CountScrofula · 41-45, M

In western music, yes. An octave contains the same intervals for every instrument.

Some instruments are stuck in "keys" so they can't play every note but everything they play sounds good together. Harmonicas for example.